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Chill hours in 98350

The short answer

98350 averages 2,121 chill hours per winter (1,7752,492 across 10 years) in USDA zone 9a.
98350 climate
Average chill hours2,121 (1,775–2,492 across 10 winters)
USDA hardiness zone9a
Last spring frosttypically March 8 – April 5
First fall frosttypically November 12 – December 3

Computed from 10 winters of ERA5 hourly temperature (Open-Meteo, 2015–2025); zones from USDA PHZM 2023. Data updated July 3, 2026. See methodology.

Every variety in our database, checked against 98350’s chill hours and zone:

How many chill hours does 98350 get?
98350 averages 2121 chill hours per winter, ranging from 1775 to 2492 across the last 10 years.
What hardiness zone is 98350?
98350 is in USDA hardiness zone 9a.

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Sources

  1. [1] Open-Meteo / Copernicus ERA5. Historical Weather API (hourly 2m temperature) — accessed July 2026
  2. [2] USDA / PRISM (Oregon State University). 2023 USDA Plant Hardiness Zone Map — accessed July 2026